A Ray of Light in Water (Index N₁) Is Incident

question 35

Multiple Choice

A ray of light in water (index n₁) is incident on its surface (with air) at the critical angle. Some oil (index n₂) is now floated on the water. The angle between the ray in the oil and the normal is:

• A) sin^-1(1.00)
• B) sin^-1(1/n₁)
• C) sin^-1(1/n₂)
• D) sin^-1(n₁/n₂)
• E) sin^-1(n₂/n₁)

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